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    <title>简易钢琴</title>
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        <li key='1' class="low"><span>1</span></li>
        <li key='2' class="low"><span>2</span></li>
        <li key='3' class="low"><span>3</span></li>
        <li key='4' class="low"><span>4</span></li>
        <li key='5' class="low"><span>5</span></li>
        <li key='6' class="low"><span>6</span></li>
        <li key='7' class="low"><span>7</span></li>
        <li key='q'><span>1</span></li>
        <li key='w'><span>2</span></li>
        <li key='e'><span>3</span></li>
        <li key='r'><span>4</span></li>
        <li key='t'><span>5</span></li>
        <li key='y'><span>6</span></li>
        <li key='u'><span>7</span></li>
        <li key='a' class="high"><span>1</span></li>
        <li key='s' class="high"><span>2</span></li>
        <li key='d' class="high"><span>3</span></li>
        <li key='f' class="high"><span>4</span></li>
        <li key='g' class="high"><span>5</span></li>
        <li key='h' class="high"><span>6</span></li>
        <li key='j' class="high"><span>7</span></li>
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